I know this post will repeat a lot of what nobody's-perfect already said, but there is additional info in here about how to apply the changes so I'm posting it anyway (and yes, it's pre-written since several posters have been asking about this @krause_collection 😞
If you previously offered Parcel Select then you were charging buyers actual cost of postage.
USPS did something very strange when they split off the old Parcel Post into the same service with different names for retail and commercial - Retail Ground and Parcel Select.
Now that USPS has normalized it, Ground Advantage is like Priority and other services where there's a retail rate and a commercial rate for the same service under the same name.
The setting to offer buyers discounted rates can be found on your shipping preferences page under the carrier specific discounts setting: https://www.ebay.com/ship/prf
When you offer buyers carrier specific discounts it will apply to all USPS services, not just Ground Adv.
Since eBay charges a fee on total cost buyer pays (item + ship + tax), by charging commercial rates you are losing money on every single package. If you want to make up for that you can add a handling fee or increase your item costs - or simply charge retail rates for a built in cushion instead of passing on the discounts.
When you apply the change to offer discounts you may not see it reflected on your live listings because of this text on the help page, "changes you make only apply to new or edited listings where a shipping cost applies."
To apply the carrier discounts, first change the setting on your shipping preferences page and save. Then pull all your listings into the bulk editor and submit changes. Even though you're not making any actual changes to the listings, you're submitting a revision through the bulk edit tool that will force listings to reindex and the shipping discount setting to take effect.
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rhythm, it won't attract the worm.
